| 单词 | double fertilization |
| 释义 | > as lemmasdouble fertilization double fertilization n. see quots. ΚΠ 1909 W. Bateson Mendel's Princ. Heredity (new ed.) xv. 270 The seed of maize is formed by a double fertilisation. It consists of two parts, an embryo, and an endosperm... The embryo is formed by the union of one nucleus of the egg~cell with one from the pollen-tube, and the endosperm is similarly formed by the union of the united polar nuclei with another from the pollen-tube. 1916 B. D. Jackson Gloss. Bot. Terms (ed. 3) 118/2 Double fertilization, in angiosperms, when one male cell from the pollen-tube fuses with the egg nucleus, the other with the upper polar nucleus, and this last with the lower polar nucleus. 1959 A. S. Foster & E. M. Gifford Compar. Morphol. Vascular Plants xix. 515 The participation of each of the two male gametes in a fusion process is uniquely characteristic of angiosperms, and is usually designated by the expression ‘double fertilization’. < as lemmas |
| 随便看 |
|
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。